ios - NSURLSession 内存泄漏

Question

即使在使 NSURLSession 无效后，使用 Instruments 运行配置文件，一些名为 TubeManager、HTTPConnectionCache 和 HTTPConnectionCacheDictionary 的类(可能是私有(private)的)仍然存在于内存中。

要重现的代码片段:

NSURLSessionConfiguration* config = [NSURLSessionConfiguration defaultSessionConfiguration];
NSURLSession* session = [NSURLSession sessionWithConfiguration:config];
NSURLRequest* request = [NSURLRequest requestWithURL:[NSURL URLWithString:@"http://www.google.com"]];
NSURLSessionDataTask* sessionDataTask = [session dataTaskWithRequest:request
                                               completionHandler:^(NSData *data, NSURLResponse *response, NSError *error)
{
    [session finishTasksAndInvalidate];
}];
[sessionDataTask resume];

Answer 1

在错误的地方调用了 finishTasksAndInvalidate...completionHandler 是处理response的，跟session无关

正确代码如下:

NSURLSessionConfiguration* config = [NSURLSessionConfigurationdefaultSessionConfiguration];
NSURLSession* session = [NSURLSession sessionWithConfiguration:config];
NSURLRequest* request = [NSURLRequest requestWithURL:[NSURL URLWithString:@"http://www.google.com"]];
NSURLSessionDataTask* sessionDataTask = [session dataTaskWithRequest:request
                                           completionHandler:^(NSData *data, NSURLResponse *response, NSError *error) {
   // handle response...
}];
[sessionDataTask resume];
[session finishTasksAndInvalidate];